Crushing and separating apparatus



Jan. 3, 1928. 1,654,638

1 P. L. CROWE nausm AND} SBPARATI'NG APPARATUS Filed Oct. 20, 1925 5Sheets-Sheet 2 Jan. 3, 1928.

P. L. CROWE CRUSHING AND SEPARATING APPARATUS Filed 0011.20, 1925 3Sheets-Sheet 3 Patented Jan. 3, 192

UNITED STATES" PAUL CBOWE, OF BALTIMORE, MARYLAND.

CRUSHIN G AND SEPARATIN G APPARATUS Application filed October 20, 1925.Serial 1%. 63,743.

This invention relates to mills for grinding and Separating ores, coaland similar materials and is directed more particularly to a millsimilar to that disclosed in my co- 6 pending application filed of evendate.

The primary object of thepresent invention is to provide a particularlysimple and highly eflicient form of apparatus for effecting a crushingand grinding of the material and simultaneously separating theimpurities, the lighter or finely divided particles, and the heavier orlarger particles each from the other.

Another objectis to provide an apparatus of this general character whichshall employ a centrally disposed rotary fan member and oppositely "andaxially extending grinding units, there being one or more crushing.elements mounted for oscillatory movement adjacent the grinding units toeffect a preliminary crushing of the material as it is fed thereto. 7

-A further object is to provide an apparatus of the aforesaid characterwhich shall employ pneumatic means for separating the lighter or finelydivided material from the heavier or coarser material and which shallemploy magnetic means for separating the ferrous impurities therefrom.

A still further object is to provide an apparatus which "shall be simplein construction, inexpensive to manufacture, and which shall be highlyeflicient and durable in'operation.

With these and other objects in view, the invention may be stated toconsist in the various novel features of construction and arran em'entor combination, all of which will e fully described hereinafter andpointed out in the appended claims.

In the drawing accompanying and forming a part of this application:

Figure 1 is a longitudinal sectional view with parts in elevation, of anapparatus embodying my-invention;

Figure 2 is a vertical sectional view taken on the line 2-2 ofFigurel;

Figure 3 is a top plan view of the apparatus;

Figure 4 is an elevation of the rotor element removed from the base andshowing a modified form of grinding unit associated therewith;

Figure 5 is a vertical sectional view taken on the line 5-5 of Figure 4;

curvature of the fan blades.

Describing the various parts by reference characters, and referringparticularly to Figs. 1-3, inclusive, 1 denotes a suitable base which isformed with a series of upwardly extending pillars 2 and 2, the latterpair defining a central and transversely disposed opening 3. The upperend of each pillar 2 is substantially semi-circular in cross section andis provided with oppositely extending lugs 4 on the sides, thereof, Acap 5 also semi-circular in cross section is adapted to fit on the topof each pillar and these caps are each' formed with oppositelyprojecting lugs 6 that are adapted to align with the aforementioned lugs4 to receive bolts 7 or other suitable fastening means.

Positioned between each pillar 2 and its cap, is an anti-frictionbearing 9 which rotatably supports a fan housing 10. Arranged within fanhousing 10 are a series of fan blades 11, 12 and 13 that are separatedfrom each other by partitions 15 and 16. Fan blades 11 and 13 are eachcurved in the same direction to produce a suction from the center ofrotation thereof while the fan blades 12 are curved in an oppositedirect-ion to create a. pressure at the center of rotation.

Pa'rtition'slfi and 16 each merge at the center with a tubular shaft 18and these shafts extend in diametrically opposite directions through thecylindrical openings defined by the aforementioned pillar blocks andcaps. As shown in-Figure 1, fan casing 10 also merges oneachside thereofwith an axially extending'hollow shaft 19 which is arrangedconcentrically with respect to shafts 18 and spaced therefrom byradially extending ribs 20, the shafts 18 and 19 forming what I shallterm a double hollow shaft. Fastened to each hollow shaft 19 by screws21 or other suitable fastening means are a plurality of longitudinallydisposed grinding plates 22 which are formed with aplu- Ill) rality ofapertures 23 that align with apertures 23 in shaft 19 to define a seriesof frusto conical shaped openings.

Disposed about each grinding cylinder are a pair of crushing and feedingplates 24 and 25. These plates are preferably identical in shape so asto facilitate production and replacement. Each plate, as shown in detailin igures 8 and 9, is formed with a side wall 26 having an offsetportion 27, and with a side wall 28 which lies entirely within oneplane. When placed in operative relation, as shown in Figure 8, a sidewall 28 of one plate will engage with the offset portion 27 of the otherplate. Each plate, adjacent the lower end is also formed with adepending cam yoke 29 which is adapted to straddle a cam 30 that iscarried by the aforementioned hollow shaft 19. In practice, I preferablyform the yoke with a slightly greater distance between the legs thereofthan the eatest diameter of the cam and provide each leg with anadjustable wear plate 31 to take up wear and also adjust the degree ofoscillation of the crusher plates.

One of the crusher plates of each pair is provided on one side wall witha pivot pin,

32 which is formed with a spherical outer extremity 33, and in the otherside wall there is formed a notch 34 so that when a pair of plates areassembled, the pivot pins will engage in the respective notches topivotally connect said plates. Each pair of crusher plates is supportedin operative relation to the grinding cylinders by the aforementionedspherical extremities 33 engaging semispherical seats 35 in the cafps 5as clearly shown in Figure 1. I pre rably interpose springs 36 betweensuitable projections 37 on the caps 5 and each side of the sphericalextremities 33 as shown in Figure 2 so that during operation of thecrusher plates, a lump of the material being ground or im- ,purity whichis too hard to be broken would not cause serious injury to theapparatusbut would permit the plates to separate against the tension ofsuch springs andthen return to normal position.

In operation, power is applied in any suitable manner (not shown) torotate fan cas-- ing 10 and grindin cylinders 22. The material to beground is introduced between each pair of crusher plates and rotation ofcams 30 will cause the crusher plates to oscillate and thereby effect apreliminary crushing of the material and also serve to feed it to thegrinding cylinder 22 where it will be round and reduced to a finelydivided con ition. Meanwhile rotation of the fan mechanism will causeblades 11 and 13 to create a suction through apertures 23 and 23 in thecylinders and hence withdraw the finely divided material to the spacebetween hollow shafts 18 and 19 and thence into fan casing 10. Fanblades 12 will receive the finely divided material and eject itthroughthe tubular shafts 18 to any desired point of destination. Thematerial which is too large to be drawn through apertures 23 and 23drops'by gravity to one side of a partition late 40 extending betweeneach pair of pilars 2 and '2 and may be removed from time to time. Ipreferably magnetize the grinding plates 22 so that any ferrousimpurities fed thereto will adhere until they reach the lowest point ofrotation of the rings and start upwardly whereupon they will drop titionplates 40. Y

In Figs. 4 and 5, I have shown a modified form of grinding cylinderwherein the plates 22 about the outer hollow shaft 19 and the apertures23 in said shaft are arranged intermediate adjacent plates. Theconstruction is otherwise identical with that previously described.

In Figs. 6 and 7, I have illustrated a further modification wherein eachof shafts 18 is formed with a pluralit-y of radially extending ribs 42that are adapted to receive and support a plurality of grinding rings 43by gravity to the other side of parare spaced apart circumferentially incommunication with the space between adjacent ribs 42. This arrangementof aper tures 44 permits only finely divided material to enter thereinand the shape thereof prevents clogging. In this instance it will benoted that shaft 19' is dispensed with and the rings 43 carried by ribs42 define the outer hollow shaft. In other respects, the apparatus isidentical in construction and operation and the same referencecharacters apply as in the other figures.

What I claim-is 1. A grinding and separating apparatus of the characterset forth comprising a base. a fan casing carried b said base. aplurality of fan units arrange within said casing. a conduit projectingfrom each side of said fan casing, and grinding cylinders arrangedconcentric with each ofsaid conduits.

2. A grinding and separating apparatus of the'character setforthcomprising a base,

a fan casing carried by saidbase, a plurality of fan units arrangedwithin said casing, a conduit projecting from each side of said fancasing, a grinding cylinder associatedwith each of said conduits, andcrushlates disposed in operative relation to grinding cylinders. I A iding and separating apparatus of the character set forth comprising abase,

afan casing carried by said base, a phi-- rality of fan units arrangedwithin said casing, conduits extending from each side of outer of saidcasing, and a grinding cylinder associated with each of said conduits,said grinding cylinders having air passages communicating with saidconduits. I

4. A grinding and separating apparatus of the character set forthcomprising a base, a fan casing carried by said base, a lurality of fanunits arranged within sai casing, a pair of concentricallydisposedconduits extending from each side of said casing, and grinding elementsassociated with the outer of eachfof said conduits, said grinding ele-=ments having air passages communicating with said outer conduits.

5. A grinding and separating apparatus of the character set forthcomprising a base, a fan casing carried by sa1d base, a plurality of fanunits arranged within said casing, a pair of concentrically disposedconduits extending from each side of said casing, a grinding cylinderassociated with the each of said conduits, said grinding cylindershaving air passages communicating with said outer conduits, and crusherplates disposed in operative relation to said grinding cylinders.

. of the character set forth comprising a base,

a fan casing carriedbysaid base, a plurality of fan units arrangedwithin said icasing, a

. double hollow shaft extending from each side of said casing, aplurality of grinding elements defining a cylinder carried by each outerhollow shaft, saidelements and outer shaft each having aperturescommunicating with the space between said shafts, and means for feedingmaterial to said grinding rings, said fan units-being adapted to drawthe finely divided material through the outer portions of said hollowshafts and eject it through the inner portions thereof.

7. A grinding and separating apparatus of the character set forthcomprising a base, a fan casin carried by said base, a plurality of fanmem ers arranged within said casing, a double hollow shaft extendingfrom each side of said casing. a plurality of longitudinally disposedgrinding plates carried by the outer shaft, said outer shaft havingapertures communicating with the space between the shafts,'crusher latesdisposed in operative relation to said grinding plates, and meansvforoscillating said crusher plates.

grinding and separating apparatus j 8. A grinding and separatingapparatus of the character set forth'comprising a base, a fan casingjournalled on said base, a pair of suction fan units and a pressure fanunit arranged withm sa1d casing, a condultextending from each side ofsa1d fan casing -and each conduit being operatively connected with saidpressure fan unit, a lurality of radially disposed ribs forms on eachconduit, a second conduit carried by said ribs, the spaces betweensaidribs connecting with said suction fan units, rindin elements carried bysaid second con uit, sai

grinding elements each having apertures communicating with the spacebetween said conduits, and means for feeding material to said grindingelements.

9. A grinding and separating apparatus of the character set forthcomprising a base, a fan casing journalled on saidbase, a pair ofsuction fan units and a' pressure fan unit arran ed within said casin ahollow, shaft exten ing from 'each side 0 said fan casin and each shaftbeing operatively. connecte with said pressure fan unit, a second hollowshaft enclosing the first mentioned hollow shaft, said suction fan unitsbeing connected with the spaces between said shafts, grinding platescarried by the outer hollow shaft, said plates'each having aperturescommunicating with the spaces between said shafts, a pair of crusherplates disposed about each group of grinding plates, and means foroscillating said crusher plates.

10. A grinding and separating apparatus of the character set forthcomprising a base, a fan casing journalled on said base, a pair ofsuction fan units and a pressure fan unit arranged within said casing, ahollow shaft extending from each side of saidfan casin and each shaftbeing operatively con-

